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AVCase design Arvin bow build
superdav95:
Very cool experiment. I’d have to say the same as others here that the wood staves I have on hand wouldn’t allow for me to build a bow this way. Should be interesting to see how it goes. There seems to be a lot of inner bend on the outlined projected profile marked on the paper to my eye. Maybe it’s an illusion just being on the paper and will look better when actual bow is bending. I’m watching this.
avcase:
--- Quote from: Selfbowman on March 07, 2023, 12:34:20 am ---Alan do I need to correct those ends before I. Go farther?
--- End quote ---
Yes, because you said you wanted that much reflex in the beginning. :) Otherwise, there won’t be much point in matching it up visually to the braced and full draw side profile shapes. It needs a little more about 13” from the tip.
Having said that, I have no idea how the heat bending affects the wood properties. But this is a lower stress area so it may not affect things very much.
One more thought. Reflex is a killer for wood bows, so less reflex like you show here makes it easier. It changes things. The limbs will need to be a little thicker.
Alan
bradsmith2010:
so the numbers would need adjustment for the new profile,,?
just some thoughts,,
you wont know what your profile will be like till you string it and pull to target draw weight,,,, its gonna shift, if it was sinew backed it would hold closer, but self bow is a little trickier ,,
a fiberglass bow will hold,, but this is a wood stave,,
when it gets to full draw it will probably shift more,,
the long string is one thing, but braced is a different pressure on the bow,
you may have to re adjust the profile after you see what it does at full draw,, right now you are just guessing,,and all the heat treating is making it dangeriosly low in moisture content,, most of the bows I blew up,, and measured the moisture content right in the middle of the stave were low in moisture content,,
avcase:
--- Quote from: avcase on March 07, 2023, 01:56:01 pm ---
--- Quote from: Selfbowman on March 07, 2023, 12:34:20 am ---Alan do I need to correct those ends before I. Go farther?
--- End quote ---
Yes, because you said you wanted that much reflex in the beginning. :) Otherwise, there won’t be much point in matching it up visually to the braced and full draw side profile shapes. It needs a little more about 13” from the tip.
Having said that, I have no idea how the heat bending affects the wood properties. But this is a lower stress area so it may not affect things very much.
One more thought. Reflex is a killer for wood bows, so less reflex like you show here makes it easier. It changes things. The limbs will need to be a little thicker.
Alan
--- End quote ---
Arvin, I checked the impact of having the tips reflexed 2” like you have Vs. 2-3/4”, and the difference turns out to be very small. There is almost no impact to the braced shape and full draw shape. Bending stresses go down by 3% and you lose a little bit of stored energy. The limb needs about .007” increase in thickness to hit the same draw weight. No cutting corners! Hahaha!
bradsmith2010:
what effect will difference in moisture content have,,? its a big piece of the puzzle,,
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